Welcome to Android Forums swaranjali.
As Crashdamage indicated, distributing paid apps without compensating the developer is piracy and we are steadfastly against that. The app you asked about seems like a professional use app and if it provides value to you, there should be no reason not to compensate the developer. If you feel there is a particular reason why you shouldn't or can't pay for it, i suggest you contact the developer directly and see if they will accommodate you.
There really isn't any further need for discussion here, so I'm going to close this thread. If you have any questions, please contact me in a private message.